Subscription.h

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#ifndef SQUID_SRC_BASE_SUBSCRIPTION_H
#define SQUID_SRC_BASE_SUBSCRIPTION_H
 
#include "base/AsyncCall.h"
 
class Subscription: public RefCountable
{
public:
    typedef RefCount<Subscription> Pointer;
 
    virtual AsyncCall::Pointer callback() const = 0;
};
 
template<class Call_>
class CallSubscription: public Subscription
{
public:
    explicit CallSubscription(const RefCount<Call_> &aCall) : call(aCall) { assert(aCall != nullptr); }
    AsyncCall::Pointer callback() const override
    {
        const AsyncCall::Pointer cb = new Call_(*call);
        if (!cb->codeContext || CodeContext::Current())
            cb->codeContext = CodeContext::Current();
        return cb;
    }
 
private:
    const RefCount<Call_> call; 
};
 
#endif /* SQUID_SRC_BASE_SUBSCRIPTION_H */